feat(ui): add similar products section to ProductDetailPage

- Introduce a new section displaying similar products on the ProductDetailPage.
- Update state management to include similar products data.
- Enhance internationalization by adding translation keys for similar products in English, German, and Spanish.

src/i18n/locales/de/product.js

@@ -28,6 +28,7 @@ export default {
   "individualPriceTotal": "Einzelpreis gesamt:",
   "setPrice": "Set-Preis:",
   "yourSavings": "Ihre Ersparnis:",
+  "similarProducts": "Ähnliche Produkte",
   "countDisplay": {
     "noProducts": "0 Produkte",
     "oneProduct": "1 Produkt",

src/i18n/locales/en/product.js

@@ -28,6 +28,7 @@ export default {
   "individualPriceTotal": "Total individual price:", // Einzelpreis gesamt:
   "setPrice": "Set price:", // Set-Preis:
   "yourSavings": "Your savings:", // Ihre Ersparnis:
+  "similarProducts": "Similar Products", // Ähnliche Produkte
   "countDisplay": {
     "noProducts": "0 products", // 0 Produkte
     "oneProduct": "1 product", // 1 Produkt

src/i18n/locales/es/product.js

@@ -28,6 +28,7 @@ export default {
   "individualPriceTotal": "Precio individual total:",
   "setPrice": "Precio del set:",
   "yourSavings": "Tus ahorros:",
+  "similarProducts": "Productos Similares",
   "countDisplay": {
     "noProducts": "0 productos",
     "oneProduct": "1 producto",